| Larkinson Limited | Extraterritorial | 2026 |
| Larry & SON Ltd | Hospitality | 2023 |
| Lasca Limited | Information & communication | 2019 |
| Laser & Skin Rejuvenation Clinic Fareham Ltd | Health & social care | 2026 |
| Laskow Ltd | Professional & scientific | 2003 |
| Laso UK Ltd | Transport & logistics | 2020 |
| Last Node Limited | Information & communication | 2026 |
| Lasting Looks Ltd | Other services | 2018 |
| LAT 55 Homes Ltd | Real estate | 2020 |
| Latitude 51 Limited | Professional & scientific | 2018 |
| Lau's International Limited | Professional & scientific | 2022 |
| Launceston Specsavers Hearcare Limited | Wholesale & retail | 2025 |
| Launceston Specsavers Limited | Wholesale & retail | 2002 |
| Lavender Field School Limited | Education | 2018 |
| Lavenham Trust Limited(The) | Real estate | 1937 |
| Law Support Engineering Ltd | Administrative & support | 2006 |
| Lawn Care Southern Limited | Administrative & support | 2018 |
| Lawnswood Limousines (Portsmouth) Limited | Other services | 2004 |
| Lawrax Ltd | Information & communication | 2025 |
| Lawrence Clarke Employee Ownership Trustees Limited | Professional & scientific | 2023 |
| Lawrence Clarke Limited | Financial services | 1998 |
| Lawson Financial Ltd | Administrative & support | 2014 |
| Lawson Property Limited | Real estate | 2016 |
| Lawsons Landscape & Building Ltd | Construction | 2020 |
| Layered Technologies Limited | Information & communication | 2014 |
| Laystone Electronics Limited | Manufacturing | 1992 |
| Lazaro Living Ltd | Real estate | 2020 |
| Lazy Days (South) Limited | Manufacturing | 2003 |
| LC Realisations (02566002) Limited | Manufacturing | 1990 |
| LCB Holdings Ltd | Financial services | 2025 |
| LCR Accountancy Limited | Financial services | 2025 |
| LD Care Group Ltd | Financial services | 2021 |
| LD Carpentry and Building Limited | Manufacturing | 2026 |
| LD Coach Cleaning Limited | Administrative & support | 2026 |
| LD Home Maintenance Ltd | Construction | 2023 |
| LDC Property Services Ltd | Real estate | 2020 |
| Ldjnnijly HUP Limited | Wholesale & retail | 2025 |
| LDS Holdings Ltd | Professional & scientific | 2019 |
| LE Heating Ltd | Construction | 2020 |
| LE Maitre Limited | Manufacturing | 2020 |
| LE Wilde Properties Limited | Real estate | 2021 |
| LEA Family Property Ltd | Real estate | 2021 |
| Leading Immigration Ltd. | Professional & scientific | 2018 |
| Leading Tech Ltd | Information & communication | 2025 |
| Leaf IT to ME Limited | Administrative & support | 2020 |
| Leaf IT to ME Management Ltd | Professional & scientific | 2024 |
| Leafy Lettings Limited | Real estate | 2020 |
| Leamington Spa Specsavers Hearcare Limited | Wholesale & retail | 2022 |
| Lean & Continuous Improvement Solutions Limited | Professional & scientific | 2013 |
| Leanda Transport Ltd | Transport & logistics | 2018 |
| Leanne Nails Studio Limited | Other services | 2019 |
| Learning Grove Education Limited | Education | 2025 |
| Learnova Ltd | Education | 2024 |
| Leatherhead Visionplus Limited | Wholesale & retail | 2004 |
| Leckwith Specsavers Limited | Wholesale & retail | 2014 |
| Ledbury Specsavers Limited | Wholesale & retail | 2016 |
| Lederle Lane Management Company Limited | Real estate | 2004 |
| Ledger Software Ltd | Information & communication | 2026 |
| LEE Fruit & VEG Ltd | Wholesale & retail | 2019 |
| LEE on Solent Residents Company Limited | Households | 2001 |
| LEE White Ltd | Hospitality | 2008 |
| Leeds Newmedica Limited | Health & social care | 2017 |
| Leeds Specsavers Hearcare Limited | Wholesale & retail | 2013 |
| Leeds Specsavers Limited | Wholesale & retail | 1991 |
| Leeds Visionplus Limited | Wholesale & retail | 1993 |
| Leek Specsavers Limited | Wholesale & retail | 2002 |
| Legacies Storage Ltd | Transport & logistics | 2025 |
| Legacy Finance & Protection Ltd | Financial services | 2025 |
| Legacy Floors UK Limited | Wholesale & retail | 2020 |
| Legatum Asset Holdings Limited | Financial services | 2019 |
| Legendary Leases Limited | Real estate | 2025 |
| Legless @11 Vineyard Limited | Wholesale & retail | 2021 |
| Leiamax Ltd | Hospitality | 2023 |
| Leicester Domi Audiology Specsavers Limited | Wholesale & retail | 2024 |
| Leicester Gipsy Lane Specsavers Limited | Wholesale & retail | 2018 |
| Leicester Newmedica Limited | Health & social care | 2023 |
| Leicester North Specsavers Limited | Wholesale & retail | 2018 |
| Leicester Specsavers Hearcare Limited | Wholesale & retail | 2003 |
| Leicester Specsavers Limited | Wholesale & retail | 1988 |
| Leicester Visionplus Limited | Wholesale & retail | 1998 |
| Leicestershire 1 Domiciliary Specsavers Limited | Wholesale & retail | 2013 |
| Leigh Specsavers Hearcare Limited | Wholesale & retail | 2022 |
| Leigh-On-Sea Specsavers Limited | Wholesale & retail | 2016 |
| Leighton Buzzard Specsavers Limited | Wholesale & retail | 2003 |
| Leighton Buzzard Visionplus Limited | Wholesale & retail | 2004 |
| Leilla Ltd | Professional & scientific | 2023 |
| Leisure Vehicles Direct Limited | Wholesale & retail | 2022 |
| Leith Specsavers Limited | Wholesale & retail | 2009 |
| Leith Visionplus Limited | Wholesale & retail | 2009 |
| Lemon Drop Consulting Ltd | Professional & scientific | 2025 |
| Lemon Squash Ltd | Financial services | 2026 |
| Lemon Tree Associates Ltd | Information & communication | 2019 |
| Lemongrass Fareham UK Ltd | Hospitality | 2018 |
| Lena's Hair Styling Limited | Other services | 2023 |
| Lending Software Solutions Limited | Administrative & support | 2010 |
| Lens-Online Limited | Administrative & support | 1999 |
| Lentune Property Services Limited | Construction | 2012 |
| LEO Property Select Services Limited | Real estate | 2018 |
| Leominster Specsavers Limited | Wholesale & retail | 2006 |
| Leominster Visionplus Limited | Wholesale & retail | 2006 |